Metar information module for SvxLink 
by Adi / DL1HRC

VERSION 1.0.99.0 (21 Feb 2017)
VERSION 1.2.0.0 (12 Mar 2018)


CHANGES:
- support for https since aviationweather.gov has switched to secure 
  http


FUNCTION:

Get METAR (weather) information from ICAO locations, usually airports and 
gives them out. With V1.2.0.0 you can request a METAR from an
airport of your interest.

command  function
0        help
01       available preconfigured airports
1...XX   request METARs from preconfigured airports in order to configuration

You have two search functions for not preconfigured airports to request a METAR 
of an airport of your interest:

1) the svx-like:

20 -> 2
21 -> A
22 -> B
23 -> C
30 -> 3
31 -> D
32 -> E
...
90 -> 9
91 -> W
92 -> X
93 -> Y
94 -> Z

Examples:
EDDP -> 32313171#
KLAX -> 52532192#


2) the star-method:

dtmf on dialpad   digit
2                 -> A
22                -> B
222               -> C
3                 -> D
33                -> E
333               -> F
...
9                 -> W
99                -> X
999               -> Y
9999              -> Z

BTW: a ** repeats the last digit

Examples:
KLAX ->  55*555*2*99#
EDDM ->  33*3**6#
ESSB ->  33*7777**22#
LEPA ->  555*33*7*2#



INSTALL:

- recompile and reinstall the latest trunk of SvxLink
- edit the /etc/svxlink/ModuleMetarInfo.conf as your own needs
- create the directory: /usr/share/svxlink/sounds/MetarInfo and copy the raw-files
  into it
- to activate the module, you also have to add an entry "ModuleMetarInfo" in
  the svxlink.conf, for example:

[SimplexLogic]
...
MODULES=ModuleHelp,ModuleEchoLink,ModuleMetarInfo
...



CONFIGURATION:
In /etc/svxlink.d/ModuleMetarInfo.conf

ID=5
ID-Number of your module, you can activate it by sending 5 and #

TIMEOUT=300
Time in seconds after that the module is deactivated if nothing happens

AIRPORTS=EDDP,EDDV,EDDF,EDDM,KJFK,...
Comma separated list of ICAO shortcuts, for that you want to get a METAR
(weather) information.
For the example above: To get the METAR info from EDDF (Frankfurt/Main Germany)
you have to send DTMF-codes 2 and # after the module MetaInfo has been activated.
Search with google for an airport in your vicinity ( google: "ICAO Amsterdam" )

STARTDEFAULT=EDDP
You can predefine one ICAO-shortcut, for that MetarInfo is called automatically
if the module has been activated. Comment out if you don't want it.

LONGMESSAGES=1
If set to 1, it gives out e.g. "Ceiling and visibility OK" instead of just
"cavok". Comment out if you don't want it.

TYPE=(XML||TXT)
Configure the type of service

SERVER=xxxx
Configure a hostname providing METAR information, e.g.
SERVER=http://tgftp.nws.noaa.gov or SERVER=https://aviationweather.gov
The protocol type (https://) _must_ be included if you want to use secure
http otherwise http is used.

LINK=xxx/yyy/zzz
The path on the webserver where the MEATAR file can be found, e.g.
LINK=data/observations/metar/stations



IMPORTANT NOTICE:
At the moment ONLY TWO combination are known to work:

1) the text file based method:
TYPE=TXT
SERVER=tgftp.nws.noaa.gov
LINK=data/observations/metar/stations

2) the new xml service by aviationweather.gov:
TYPE=XML
SERVER=aviationweather.gov
LINK=/adds/dataserver_current/httpparam?dataSource=metars&requestType=retrieve&format=xml&hoursBeforeNow=3&mostRecent=true&stationString=



PROBLEMS AND BUGS:
cat problems > dl1hrc [at] gmx.de



KNOWN PROBLEMS:
- not all precipitations and combinations of it could be tested out
- all after RMK can not be given out



ToDo:
- SIGMET's, NOTAMS ?